RadiSys ATCA-4616 Specifikace stáhnout pdf (Strana 29)

Software Architecture

Shelf FRU information redundancy

DuringnormalshelfoperationwithredundantShelfManagers,therearealwaysatleastthree

persistentcopiesoftheshelfFRUinformation.TheshelfFRUinformationisinitiallystoredina

singleshelfFRUdeviceinanATCA‐6000shelf,andintwoshelfFRUdevicesinanATCA‐6006,

ATCA‐6014,orATCA‐6016shelf.Inaddition,boththeactiveandstandbyShelfManagerskeep

apersiste ntcacheoftheshelfFRUinformation.OneofthefirststepstakenbytheactiveShelf

Managerduringinitializationislocating,validating,andcrea tingorupdatingthesepersistent

cachesoftheshelfFRUinformation.

TheactiveShelfManagervalidatesthechecksumofeachshelfFRUinformationfileandalso

comparesthecontentsofthefilestoresolveanyconflicts.Ifaconflictexists,theShelf

ManagergivesprioritytotheshelfFRUdevicecontentsoverthecopiescachedbytheShelf

Manager.OncetheShelfManageridentifiesgoodcontent,itcopiesoverthecontentofthe

otherlocationsiftheircontentsdiffer.

TheShelfManagerusesthesebasicrulestoselectgoodcontent:

•IfashelfFRUdevice’schecksumisvalid(anditscontentdoesnotconflictwithanother

shelfFRUdeviceontheATCA‐6006shelf),theShelfManagerselectstheshelfFRUdevice

content.

•IfnoshelfFRUdevicehasavalidchecksumbutthecopiescachedbyboththeactiveand

standbyShelfManagerhavevalidchecksumsandmatchingcontent,theShelfManager

selectstheactiveShelfManager’scachedcontent.

•IftwoshelfFRUdeviceshaveconflictingcontent,theShelfManagercomparestheir

contenttotheShelfManager‐cachedcopiesandselectstheshelfFRUdevicecontentthat

matchesmorecachedcopies.

Note:ThisruleappliestotheATCA‐6006shelfonly.AlthoughtheATCA‐6014and

ATCA‐6016shelveseachhavetwoshelfFRUdevices,only oneisread—thedevice

accessibletotheactiveRCM.Thecontentsofthetwodevicesarenotcompared.

•IfvalidshelfFRUinformationcannotbelocatedoraconflictcannotbere solved,theShelf

Managergenerate sashelfFRUInvalidalarmtorequestoperatorassistanceinupdating

theshelf

FRUinformation.

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RadiSys ATCA-4616 Specifikace Strana 29